Dodge Chrysler 5.7 Hemi 397 stroker forged piston set. Wiseco brand This set is for use with K1 stroker crankshaft of 4.080 in., .020 oversize bore of 3.937 with a special rod length of 6.125 in. and a pin size of .866 in. CH = 1.080 Compression is 11.1-1 with a 85cc chamber head Ring grooves are 1.0mm 1.2mm 2.8mm They work with either a floating piston pin or pressed pin type connecting rod. Set includes 8 pistons, 8 piston pins, piston rings and pin lock rings. Made to use with K1 connecting rod # K1DH6125AHGB8A and K1 Stroker crank # k13454080SA6F